水様透明の内容液を有し診断に難渋した頭皮類皮腫の1例

A Case Report of a Scalp Dermoid Cyst Containing Watery-clear Fluid

Ⅰ．はじめに

　頭部の嚢胞性疾患には外傷による帽状腱膜下血腫など頭蓋外の軟部組織の損傷^3），頭蓋骨膜洞，偽性髄膜瘤^4,5），先天性疾患である二分頭蓋^5），類表皮腫^7），類皮腫^1,6）などがあるが，個々の疾患により治療方針が異なり，これらの鑑別は重要である．今回われわれは生後7カ月の女児に発症した嚢胞性疾患で，鑑別に難渋した症例を経験したので報告する．

We report a case of a 7-month-old female with a dermoid cyst on the anterior fontanelle. She was born with a vac-uum extractor. Two weeks later, her scalp on the anterior fontanelle bulged. A doctor was consulted when she was 3 months old, because the tumor was enlarging. Magnetic resonance image (MRI) showed a cystic mass on the ante-rior fontanelle. She was brought to our institute. At the first medical examination, she was alert and had no neurologi-cal deficit. The tumor was suspected to be a sinus pericranii or a pseudo meningocele. She was observed as an out patient, but the tumoral size become more enlarged.